Arsenal completed a terrible week for hanging onto leads as they let in two last goals to lose at Swansea .

On-fire Alexis Sanchez had given the Gunners the lead in the second half but a free-kick from Gylfi Sigurdsson 15 minutes from time and a header from Bafetimbi Gomis completed the turnaround in rain-soaked South Wales.

An immaculate minutes' silence was observed before kick-off on Remembrance Sunday with both sides sporting red poppies on their shirts.

Theo Walcott made the bench again as he continued his return from nine months out injured and was joined by Jack Wilshere - himself returning after two-and-a-half weeks out injured.

Swansea had their own injury worries a few minutes into the game when Ashley Williams went down but he was able to carry on.

The Swans had the better of the opening exchanges; Sigurdsson swung over a free-kick which Calum Chambers headed way while Angel Rangel had a shot blocked after a good run and cross from Neil Taylor.

The Swans wanted a penalty after 20 minutes when Wilfried Bony appeared to be shoved in the back by Chambers but referee Phil Dowd waved away their appeals.

(Image: Stu Forster)

Arsenal then wanted a penalty of their own as Oxlade-Chamberlain claimed he was tugged back by Jefferson Montero, but again Dowd said no.

Back down the other end we went for yet another penalty shout, this time for handball, as Sung-Yueng Ki swung a cross into the box and it hit an Arsenal defender but again nothing was given.

The first real chance of the game fell to Marvin Emnes after he was fed perfectly by Bony but his low drilled shot was right at Szczesny, who batted it away.

Ki Sung-Yueng and Taylor picked up yellow cards just before the break for the home side, both for rash challenges on Oxlade-Chamberlain, as the rain continued to lash down in South Wales.

Arsenal's best chance came on the stroke of half-time as Sanchez found Danny Welbeck, who played a neat one-two with Oxlade-Chamberlain before firing at goal, but it was too close to Fabianski, who easily palmed it clear.

(Image: Michael Steele)

Ramsey then flashed a well-taken volley just wide before Per Mertesacker headed wide from a corner as the Gunners finished the first half the stronger of the two sides.

Arsenal picked up where they left off in the second half as Sanchez played in Oxlade-Chamberlain, but his weak left-footed shot was right at Fabianski.

The Gunners continued to press forward but found a wall of Swansea defenders and any real chances hard to come by.

On the hour mark Cazorla fired off a snap shot from just outside the box but it was right at Fabianski. The rain got stronger and as the ground became more slippery the yellow cards followed; Mertesacker, Ramsey and Flamini all went into the book before Arsenal finally found the net.

Welbeck was sent clear down the right and cut inside brilliantly past Williams before squaring to Sanchez who has the simple task of tapping into the net.

(Image: PA)

Swansea should have been level a few minutes later when Montero did well to find Bony for the Ivorian's finish was weak and skimmed off the surface and clear.

They were on level terms, though, with 15 minutes to go when Sigurdsson curled a superb free-kick into the top corner, giving Szczesny no chance.

And they completed an amazing turnaround a few minutes later when Bafetimbi Gomis headed in Montero's cross mere minutes after coming on as substitute.

The result means Swansea leapfrog Arsenal in the table, as Arsene Wenger is left to contemplate another late capitulation.